//
// async_tcp_echo_server.cpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#include "pch.h"

using boost::asio::ip::tcp;

class session
    : public std::enable_shared_from_this<session>
{
  public:
    session(tcp::socket socket)
        : socket_(std::move(socket))
    {
    }

    void start()
    {
        do_read();
    }

  private:
    void do_read()
    {
        auto self(shared_from_this());
        socket_.async_read_some(boost::asio::buffer(data_, max_length),
                                [this, self](boost::system::error_code ec, std::size_t length) {
                                    if (!ec)
                                    {
                                        do_write(length);
                                    }
                                });
    }

    void do_write(std::size_t length)
    {
        auto self(shared_from_this());
        boost::asio::async_write(socket_, boost::asio::buffer(data_, length),
                                 [this, self](boost::system::error_code ec, std::size_t /*length*/) {
                                     if (!ec)
                                     {
                                         do_read();
                                     }
                                 });
    }

    tcp::socket socket_;
    enum
    {
        max_length = 1024
    };
    char data_[max_length];
};

class server
{
  public:
    server(boost::asio::io_context &io_context, short port)
        : acceptor_(io_context, tcp::endpoint(tcp::v4(), port))
    {
        do_accept();
    }

  private:
    void do_accept()
    {
        acceptor_.async_accept(
            [this](boost::system::error_code ec, tcp::socket socket) {
                if (!ec)
                {
                    std::make_shared<session>(std::move(socket))->start();
                }

                do_accept();
            });
    }

    tcp::acceptor acceptor_;
};

int main(int argc, char *argv[])
{
    try
    {
        if (argc != 2)
        {
            std::cerr << "Usage: PrecompiledHeaderDemo <port>\n";
            return 1;
        }

        boost::asio::io_context io_context;

        server s(io_context, std::atoi(argv[1]));

        io_context.run();
    }
    catch (std::exception &e)
    {
        std::cerr << "Exception: " << e.what() << "\n";
    }

    return 0;
}